GTA IV smashes UK day one sales record: 609k (360: 335k PS3 274k)

[Munkeh111]

So that would probably equate to around 2.4m million copies sold (if you take the UK as 1/4 of the market) so it will probably be over 3m by the end of the week in Europe, (though GAME Amazon and play are all sold out in the UK)